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EP1794227B1 - Procede de preparation d'une composition et de nanocomposites a partir de cette composition - Google Patents

Procede de preparation d'une composition et de nanocomposites a partir de cette composition Download PDF

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Publication number
EP1794227B1
EP1794227B1 EP05789908A EP05789908A EP1794227B1 EP 1794227 B1 EP1794227 B1 EP 1794227B1 EP 05789908 A EP05789908 A EP 05789908A EP 05789908 A EP05789908 A EP 05789908A EP 1794227 B1 EP1794227 B1 EP 1794227B1
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Prior art keywords
block
poly
mixture
styrene
layered silicate
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EP1794227A1 (fr
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James M. 3M Center NELSON
Ryan E. 3M Center MARX
John W. 3M Center LONGABACH
Kenneth J. 3M Center HANLEY
Mark E. 3M Center NAPIERALA
Myles L. 3M Center BROSTROM
Jeffrey J. 3M Center CERNOHOUS
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3M Innovative Properties Co
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3M Innovative Properties Co
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/005—Reinforced macromolecular compounds with nanosized materials, e.g. nanoparticles, nanofibres, nanotubes, nanowires, nanorods or nanolayered materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/10—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2353/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes

Definitions

  • nanocomposite has an exfoliated layered silicate as the reinforcing material wherein the layered structure is broken down and individual silicate platelets are dispersed throughout the polymeric resin.
  • Layered silicates are typically composed of stacked silicate platelets.
  • the silicate platelets typically have a thickness on the order of about one nanometer and typically have an aspect ratio of at least about 100.
  • the spaces between these platelets are called gallery spaces. Under the proper conditions, the gallery spaces can be filled with monomer, oligomer, or polymer. This increases the distance between silicate platelets, swelling the layered silicate in a method termed intercalation. If the layered silicate swells so much that at least some of the individual silicate platelets are no longer organized into stacks, those individual silicate platelets are said to be "exfoliated".
  • the present invention provides a method of making a composition, the method comprising:
  • the second mixture may be mixed with a polymeric resin to form a nanocomposite.
  • Methods according to the present invention typically provide a convenient and versatile method for manufacture of a wide variety of nanocomposite materials.
  • d-layer spacing values refer to d-layer spacing values determined at 25 °C.
  • the term “block” refers to a portion of a block copolymer, comprising many monomeric units, that has at least one feature which is not present in the adjacent portions;
  • the term “block copolymer” refers to a copolymer composed of constitutionally different blocks in linear sequence;
  • the term “monomeric unit” refers to the largest constitutional unit contributed by a single monomer molecule to the structure of a polymer;
  • the phrase "compatible with the layered silicate” means capable of intercalating the layered silicate;
  • the term “exfoliated silicate platelet” refers to an individual silicate platelet that is less than 5 nanometers thick and has an aspect ratio of at least 10, and is not associated as a face-to-face stack with at least one other such silicate platelet, regardless of whether the silicate platelet was made by exfoliating a layered silicate or by some other method.
  • FIG. 1 One exemplary embodiment of the process is shown in FIG. 1, wherein layered silicate 110, block copolymer 120, and solvent 130 are mixed together to form first mixture 140.
  • First mixture 140 is then masticated in a suitable apparatus 145 (that is, a kneader or extruder) while solvent 130 is removed from it resulting in second mixture 150.
  • Second mixture 150 is then combined with fluid polymeric resin 160 resulting in nanocomposite 180.
  • Useful layered silicates that may be used as the first layered silicate according to the present invention include, for example, natural phyllosilicates, synthetic phyllosilicates, organically modified phyllosilicates (for example, organoclays), and combinations thereof.
  • Examples of natural phyllosilicates include smectite and smectite-type clays such as montmorillonite, nontronite, bentonite, beidellite, hectorite, saponite, sauconite, fluorohectorite, stevensite, volkonskoite, magadiite, kenyaite, halloysite, and hydrotalcite.
  • smectite and smectite-type clays such as montmorillonite, nontronite, bentonite, beidellite, hectorite, saponite, sauconite, fluorohectorite, stevensite, volkonskoite, magadiite, kenyaite, halloysite, and hydrotalcite.
  • Suitable synthetic phyllosilicates include, for example, those prepared by hydrothermal processes as disclosed in U.S. Pat. Nos. 3,252,757 (Granquist ); 3,666,407 (Orlemann ); 3,671,190 (Neumann ); 3,844,978 (Hickson ); 3,844,979 (Hickson ); 3,852,405 (Granquist ); and 3,855,147 (Granquist ).
  • LAPONITE synthetic smectite clays
  • Southern Clay Products, Inc. Gonzales, Texas
  • LAPONITE synthetic smectite clays
  • Commercially available synthetic smectite clays are commercially available, for example, from Southern Clay Products, Inc., Gonzales, Texas, under the trade designation "LAPONITE” including, for example, “LAPONITE B” (a synthetic layered fluorosilicate), “LAPONITE D”(a synthetic layered magnesium silicate), and “LAPONITE RD”(a synthetic layered silicate).
  • Organoclays are typically smectite or smectite-type clays produced by interacting the unfunctionalized clay with one or more suitable intercalants.
  • intercalants are typically organic compounds, which are neutral or ionic.
  • Useful neutral organic intercalants include polar compounds such as amides, esters, lactams, nitriles, ureas, carbonates, phosphates, phosphonates, sulfates, sulfonates, nitro compounds, and the like.
  • the neutral organic intercalants can be monomeric, oligomeric or polymeric. Neutral organic intercalants may intercalate into the layers of the clay through hydrogen bonding without completely replacing the original charge balancing ions.
  • Useful ionic intercalants are typically cationic surfactants such as, for example, onium compounds such as ammonium (primary, secondary, tertiary, and quaternary), phosphonium, or sulfonium derivatives of aliphatic, aromatic or aliphatic amines, phosphines and sulfides.
  • Useful onium ions include, for example, quaternary ammonium ions having at least one long chain aliphatic group (for example, octadecyl, myristyl, or oleyl) bound to the quaternary nitrogen atom. Further details concerning organoclays and methods for their preparation may be found, for example, in U.S. Pat. Nos. 4,469,639 (Thompson et al. ); 6,036,765 (Farrow et al. ); and 6,521,678B1 (Chaiko ).
  • Organoclays are available from commercial sources.
  • Southern Clay Products offers various organoclays under the trade designations "CLOISITE” (derived from layered magnesium aluminum silicate) and “CLAYTONE” (derived from natural sodium bentonite) including “CLAYTONE HY”, “CLAYTONE AF”, “CLOISITE 6A” (modifier concentration of 140 meq/100 g), “CLOISITE 15A” (modifier concentration of 125 meq/100 g), and “CLOISITE 20A” (modifier concentration of 95 meq/100 g).
  • Organoclays are also available commercially from Nanocor, Arlington Heights, Illinois, under the trade designation "NANOMER”.
  • layered silicates exhibit a d-layer spacing that can be determined by well-known techniques such as X-ray diffraction (XRD) and/or transmission electron microscopy (TEM).
  • XRD X-ray diffraction
  • TEM transmission electron microscopy
  • the d-layer spacing typically increases as intercalation between individual silicate layers by the block copolymer proceeds until the layers become so widely separated that they are considered exfoliated and no d-layer spacing is observable by XRD or TEM.
  • Block copolymers are generally formed by sequentially polymerizing different monomers.
  • Useful methods for forming block copolymers include, for example, anionic, cationic, coordination, and free radical polymerization methods.
  • Useful block copolymers may have any number of blocks greater than or equal to two (for example, di-, tri-, tetra-block copolymers), and may have any form such as, for example, linear, star, comb, or ladder.
  • at least one block should have an affinity for the chosen layered silicate (including organoclay).
  • This block may be hydrophilic or hydrophobic (for example, when using organoclays) in nature.
  • the block copolymer is thermoplastic, although the polymer may not be thermoplastic as long as it is capable of intercalating the layered silicate.
  • the block copolymer may be liquid.
  • Hydrophilic blocks typically have one or more polar moieties such as, for example, acids (for example, -CO 2 H, -SO 3 H, -PO 3 H); -OH; -SH; primary, secondary, or tertiary amines; ammonium N-substituted or unsubstituted amides and lactams; N-substituted or unsubstituted thioamides and thiolactams; anhydrides; linear or cyclic ethers and polyethers; isocyanates; cyanates; nitriles; carbamates; ureas; thioureas; heterocyclic amines (for example, pyridine or imidazole)).
  • Useful monomers that may be used to introduce such groups include, for example, acids (for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, and including methacrylic acid functionality formed via the acid catalyzed deprotection of t-butyl methacrylate monomeric units as described in U.S. Pat. Publ. No. "2004/0024130" (Nelson et al.
  • acrylates and methacrylates for example, 2-hydroxyethyl acrylate
  • acrylamide and methacrylamide for example, N-substituted and N,N-disubstituted acrylamides
  • N-t-butylacrylamide for example, N,N-(dimethylamino)ethylacrylamide, N,N-dimethylacrylamide, N,N-dimethylmethacrylamide
  • aliphatic amines for example, 3-dimethylaminopropyl amine, N,N-dimethylethylenediamine
  • heterocyclic monomers for example, 2-vinylpyridine, 4-vinylpyridine, 2-(2-vin
  • Hydrophobic blocks typically have one or more hydrophobic moieties such as, for example, aliphatic and aromatic hydrocarbon moieties such as those having at least 4, 8, 12, or even 18 carbon atoms; fluorinated aliphatic and/or fluorinated aromatic hydrocarbon moieties, such as for example, those having at least 4, 8, 12, or even 18 carbon atoms; and silicone moieties.
  • hydrophobic moieties such as, for example, aliphatic and aromatic hydrocarbon moieties such as those having at least 4, 8, 12, or even 18 carbon atoms; fluorinated aliphatic and/or fluorinated aromatic hydrocarbon moieties, such as for example, those having at least 4, 8, 12, or even 18 carbon atoms; and silicone moieties.
  • Such monomers may be readily obtained from commercial sources or prepared, for example, according to the procedures in U.S. Pat. Appl. Publ. No. 2004/0023016 (Cernohous et al. ).
  • Examples of useful block copolymers having hydrophobic and hydrophilic blocks include poly(isoprene-block-4-vinylpyridine); poly(isoprene-block-methacrylic acid); poly(isoprene-block-N,N-(dimethylamino)ethyl acrylate); poly(isoprene-block-2-diethylaminostyrene); poly(isoprene-block-glycidyl methacrylate); poly(isoprene-block-2-hydroxyethyl methacrylate); poly(isoprene-block-N-vinylpyrrolidone); poly(isoprene-block-methacrylic anhydride); poly(isoprene-block-(methacrylic anhydride-co-methacrylic acid)); poly(styrene-block-4-vinylpyridine); poly(styrene-block-2-vinylpyridine); poly(styrene-block-
  • the block copolymer should be chosen such that at least one block is capable of intercalating the layered silicate.
  • this typically means that at least one block should be hydrophilic, while in the case of organoclays the block may be hydrophilic or hydrophobic.
  • the choice of remaining blocks of the block copolymer will typically be directed by the nature of any polymeric resin with which the second mixture will be subsequently combined.
  • block copolymer any amount of block copolymer may be used, however, typically the block copolymer is included in an amount in a range of 0.01 to 10 parts or more by weight for every part of the layered silicate included in the first mixture. More typically, the block copolymer is included in an amount in a range of 0.05 to 2 parts or more by weight for every part of the layered silicate included in the first mixture.
  • Useful solvents include, for example, organic solvents, water, and combinations thereof.
  • organic solvents include esters (for example, ethyl acetate, butyl acetate, beta-ethoxyethyl acetate, beta-butoxy-beta-ethoxyethyl acetate, methylcellosolve acetate, cellosolve acetate, diethylene glycol monoacetate, methoxytriglycol acetate, and sorbitol acetate), ketones (for example, methyl isobutyl ketone, 2-butanone, acetonylacetone, and acetone), aromatic hydrocarbons (for example, benzene, toluene, and xylene), aliphatic hydrocarbons (for example, cyclohexane, heptane, octane, decane, and dodecane), nitriles (for example, acetonitrile), ethers (for example, t
  • the solvent is as a lubricant that aids in dispersing the layered silicate and/or exfoliated silicate platelets in the block copolymer.
  • the solvent need not be selected based on its ability to swell the layered silicate or even the block copolymer.
  • the solvent may be selected such that it does not swell the layered silicate.
  • the solvent may be selected such that it does not swell the block copolymer.
  • the solvent is at least partially removed under shear. Typically, this may be done by connecting a vacuum pump or other device for reducing pressure to the shearing apparatus used to carry out the process.
  • the mixture of the solvent, block copolymer, and layered silicate contains at least 10 percent by weight of solvent, based on the total weight of the mixture.
  • the mixture may contain at least 10, 20, 30, 40, 50, 60, 70, 80, or even at least 90 percent or more by weight of solvent, based on the total weight of the mixture.
  • the processed mixture contains less than or equal to 5 percent by weight of solvent, based on the total weight of the second mixture.
  • the second mixture may contain less than or equal to 4, 3, 2, 1, or even less than 0.1 percent by weight of solvent, based on the total weight of the second mixture.
  • solvent levels that are achievable according to the method of the present invention are in a range of from 0.2 to 0.5 percent by weight of solvent, based on the total weight of the second mixture.
  • the weight of the first layered silicate decreases to less than twenty percent of its initial weight before removal compounding with the block copolymer and solvent (that is, first weight).
  • the amount of the first layered silicate may decrease, during mixing and at least partial removal of solvent, to a weight that is less than 20, 15, 10, 5, or even less than 1 percent or less of the initial weight.
  • the first mixture is masticated during at least partial removal of the solvent.
  • Equipment that is useful for masticating the first mixture includes, for example, vacuum kneaders and extruders. Such equipment is well known and/or readily commercially available; typically equipped with devolatilizing capabilities (for example, vacuum ports) and/or temperature-controlled zones. The equipment may have a single port (other than any vacuum ports) for introducing and extracting material, or it may have separate inlet and outlet ports as in the case of an extruder or high viscosity processor.
  • a suitable high viscosity processor that is, a kneader
  • a high viscosity processor typically supplied with vacuum equipment
  • This high viscosity processor provides intensive mixing and kneading in combination with large heat-transfer surfaces and long residence times. The heat transfer surfaces are continuously swept by kneading elements, which increases thermal efficiency and ensures high heat transfer rates.
  • the inner cavity also has a relatively large working volume (that is, volume occupied by the reaction mixture) and fill level, thus allowing for high throughput and long retention times. Yet, the working volume occupies only 60 percent of the total volume of the reactor, which provides ample room to allow for disengagement and flashing of off-gases and vapors as they are brought to the bulk surface by the intensive mixing.
  • kneader fitted with a vacuum system
  • MKD 0,6 - H 60 HIGH-PERFORMANCE MEASURING KNEADER is that marketed by IKA Works, Inc., Wilmington, North Carolina, under the trade designation "MKD 0,6 - H 60 HIGH-PERFORMANCE MEASURING KNEADER".
  • kneader Another example of a suitable high performance kneader is commercially available under the trade designation "SRUGO SIGMA KNEADER" from Srugo Machines Engineering, Netivot, Israel. This kneader can be connected to vacuum equipment by vacuum ports on the kneader.
  • Useful extruders include, for example, single- and multiple-screw extruders and reciprocating extruders.
  • suitable extruders include those marketed by Coperion Buss AG, Pratteln, Switzerland, under the trade designation "MKS", for example, "MKS 30".
  • the extent of intercalation and /or exfoliation of the layered silicate can typically be controlled in large part through variables including, for example, concentration or composition of components, pressure (that is, vacuum) in the mixing apparatus, the temperature profile of the process (for example, isothermal or ramped), screw design, order of addition of materials, the level of applied shear force and/or rate, and the duration of the mixing process.
  • intercalation and/or exfoliation may typically be enhanced by increasing the temperature or reducing the rate of solvent removal (for example, by lessening the degree of an applied vacuum).
  • the physical properties and chemical properties of the solvent, first layered silicate, and block copolymer should be considered, for example, such that decomposition of the first layered silicate and/or block copolymer may be kept at a relatively low level.
  • Such variables may be modified in a continuous or stepwise manner, or they may be maintained at a constant level.
  • the temperature of kneader or extruder is typically kept above the glass transition temperature and/or melting temperature of the block copolymer, although this is not a requirement.
  • the solvent may serve as a lubricant for the masticating process and need not be capable of swelling the first layered silicate and/or the block copolymer under the process conditions.
  • the second mixture may be mixed with (that is, let down in) a polymeric resin or mixture of polymeric resins.
  • the second mixture may comprise a masterbatch that typically has a relatively high content of intercalated layered silicates and/or exfoliated silicate platelets.
  • the total amount of the second layered silicate and exfoliated silicate platelets in the masterbatch may comprise at least 30, 40, 50, 60 percent by weight or more of the second mixture.
  • Mixing of mixture comprising the second mixture with the polymeric resin may be accomplished by any suitable technique, typically depending on the nature of the polymeric resin. Such techniques include for example, extruding, stirring, and kneading, optionally in the presence of a solvent.
  • the second mixture and/or polymeric resin may be added, for example, in granular form or in fluid (for example, molten form).
  • the second mixture is combined with a fluid polymeric resin within the body of a screw extruder, whereupon it forms a fluid (for example, molten) nanocomposite material that may be solidified (for example, by cooling or curing) after extraction from the extruder, although other methods of combining the polymeric resin and second mixture may also be used.
  • any amount of the second mixture may be let down into any amount of polymeric resin, for example, depending on the intended physical properties of the resultant nanocomposite.
  • the weight ratio of the polymeric resin to the block copolymer may be in a range of 20 to 200, inclusive.
  • Any organic polymeric resin may be used in practice of the present invention.
  • useful polymeric resins may be thermoplastic, thermosetting, or a combination thereof.
  • methods according to the present invention are well suited for use with thermoplastic polymeric resins.
  • thermoplastic polymeric resins include, for example: polylactones such as, for example, poly(pivalolactone) and poly(caprolactone); polyurethanes such as, for example, those derived from reaction of diisocyanates such as 1,5-naphthalene diisocyanate, p-phenylene diisocyanate, m-phenylene diisocyanate, 2,4-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, 4,4'-diphenylisopropylidene diisocyanate, 3,3'-dimethyl-4,4'-diphenyl diisocyanate, 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, 3,3'-dimeth
  • Useful polymeric resins also include fluoropolymers, that is, at least partially fluorinated polymers.
  • fluoropolymers include polyvinylidene fluoride; copolymers of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride; copolymers of tetrafluoroethylene, hexafluoropropylene, perfluoropropyl vinyl ether, and vinylidene fluoride; tetrafluoroethylene-hexafluoropropylene copolymers; tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymers (for example, tetrafluoroethylene-perfluoro(propyl vinyl ether)); and combinations of thereof.
  • thermoplastic fluoropolymers include, for example, those marketed by Dyneon LLC, Oakdale, Minnesota, under the trade designations "THV” (for example, “THV 220", “THV 400G”, “THV 500G”, “THV 815”, and “THV 610X”), “PVDF”, “PFA”,”HTE”, “ETFE”, and “FEP”; those marketed by Atofina Chemicals, Philadelphia, Pennsylvania, under the trade designation “KYNAR” (for example, “KYNAR 740”); those marketed by Solvay Solexis, Thorofare, New Jersey, under the trade designations "HYLAR” (for example, “HYLAR 700”) and “HALAR ECTFE”.
  • THV for example, “THV 220", “THV 400G”, “THV 500G”, “THV 815”, and “THV 610X
  • KYNAR for example, “KYNAR 740”
  • HYLAR for example, “HYLAR 700”
  • thermosetting polymeric resins include, for example, epoxy resins, alkyd resins, acrylic resins, one-part and two-part urethane resins, cyanate resins, phenolic resins, aminoplast resins, and combinations thereof. If a thermosetting resin is used, a suitable curative for that resin (for example, a thermal curative and/or photocurative) may also be included with the polymeric resin.
  • a suitable curative for that resin for example, a thermal curative and/or photocurative
  • the first and/or second mixtures and/or nanocomposite may further contain one or more additives such as, for example, surfactants, flame proofing agents, fillers, ultraviolet absorbers, antioxidants, tackifier resins, colorants, fragrances, or antimicrobial agents.
  • additives such as, for example, surfactants, flame proofing agents, fillers, ultraviolet absorbers, antioxidants, tackifier resins, colorants, fragrances, or antimicrobial agents.
  • Nanocomposites prepared according to the present invention are dispersions, typically an isotropic dispersion of exfoliated silicate platelets in the polymeric resin.
  • the amount of exfoliated silicate platelets in the nanocomposite may be in any amount, but are typically in a range of from 0.1 to 10 percent by weight, more typically in a range of from 0.5 to 7 percent by weight, and even more typically in a range of from 1 to 5 percent by weight, inclusive, based on the total weight of the nanocomposite.
  • the weight ratio of the exfoliated silicate platelets to the second layered silicate in the nanocomposite may be at least 1, 2, 3, 4, 5, 10, 50 or more, although lesser weight ratios may also be used.
  • the polymeric resin in the nanocomposite may be hardened, for example, by cooling in the case of thermoplastic resins, or by at least partially curing in the case of thermosetting polymeric resins.
  • Nanocomposites prepared according to the present invention are useful, for example, in the manufacture of barrier films or bottles, and flame retardant materials.
  • OC1 Organically modified montmorillonite clay available under the trade designation "CLOISITE 20A” from Southern Clay Products (modified with methyl, tallow ( ⁇ 65% C 18 ; ⁇ 30% C 16 ; ⁇ 5% C 14 ), quaternary ammonium chloride; XRD analysis of OC1 as purchased showed a d-layer spacing of 2.41 nanometers (nm).
  • PS Polystyrene available under the trade designation "STYRON 615APR” from Dow Chemical Co., Midland, Michigan.
  • P(I-VP) diblock copolymer, poly(isoprene-block-4-vinylpyridine), synthesized using a stirred tubular reactor process generally as described in Example 4 of U.S. Pat. No.
  • Reflection geometry X-ray scattering data were collected using a four-circle diffractometer (available under the trade designation "HUBER (424/511.1)” from Huber Diffr reliestechnik GmbH, D83253 Rimsting, Germany), copper K-alpha radiation, and scintillation detector registry of the scattered radiation.
  • the incident beam was collimated to a circular aperture of 0.70 mm.
  • Scans were conducted in a reflection geometry from 0.5 to 10 degrees (2 theta) using a 0.05 degree step size and 10 second dwell time.
  • a sealed tube X-ray source and X-ray generator settings of 40 kV and 20 mA were used.
  • Data analysis and peak position definition were determined using X-ray diffraction analysis software available under the trade designation "JADE” from MDI, Inc., Livermore, California.
  • TEM was performed using a transmission electron microscope operated at 200 kV, available under the trade designation "JEOL 200CX” from JEOL USA, Peabody, Massachusetts.
  • GPC Gel Permeation Chromatography
  • the GPC was system operated at room temperature using THF eluent that moved at a flow rate of approximately 0.95 mL/minute.
  • a refractive index detector was used to detect changes in concentration.
  • Number average molecular weight (M n ) and polydispersity index (PDI) calculations were calibrated using narrow polydispersity polystyrene controls ranging in molecular weight from 600 to 6 x 10 6 g/mole. The actual calculations were made with software (available under the trade designation "CALIBER" from Polymer Labs, Amherst, Massachusetts).
  • each block was determined by 1 H Nuclear Magnetic Resonance ( 1 H NMR) spectroscopy analysis. Specimens were dissolved in deuterated chloroform at a concentration of about 10 percent by weight and placed in a 500 MHz NMR Spectrometer available under the trade designation "UNITY 500 MHZ NMR SPECTROMETER” from Varian, Inc., Palo Alto, California. Block concentrations were calculated from relative areas of characteristic block component spectra.
  • HVP high viscosity processor
  • LIST DISCOTHERM B6 HIGH VISCOSITY PROCESSOR a high viscosity processor
  • the HVP has a horizontal, cylindrical body with a concentric agitator shaft. Mounted on the shaft (and extending perpendicular to the shaft) are disk elements having angled peripheral mixing-kneading bars and stationary hook-shaped bars mounted on the inside of the housing that interact with and clean the shaft and disk elements as they rotate.
  • the HVP has a twin-screw discharge for material removal.
  • the total volume of the HVP is 17.5 L, with a working volume of 12 L.
  • the housing, shaft, and disk elements are all heated via a hot oil heating system.
  • the heat transfer area in the reactor is 0.67 m 2 . Temperature is controlled and monitored in three locations within the HVP: (1) the reactor entrance zone (zone 1), (2) the reactor intermediate zone (zone 2) and (3) the reactor exit zone (zone 3).
  • a variable speed motor drives the agitator shaft at a maximum torque of 1200 Nm.
  • a vacuum pump is attached to the reactor at the top of zone 2 for vapor removal.
  • the feed solution is fed into the HVP via a gear pump operating at 540 ml/minute.
  • the HVP is heated at 165 °C, at a vacuum setting of 70 torr.
  • the main agitator shaft is stirred at a rate of 63 rpm and the discharge screw is run at 166 rpm.
  • Continuous twin-screw extrusion is carried out using a co-rotating 25-mm twin-screw extruder (TSE) with 41:1L/D, available under the trade designation "COPERION ZSK-25 WORLD LAB EXTRUDER” from Coperion, Ramsey, New Jersey. Barrel zones for the extruder are 4D (100 mm) in length. The extruder is operated at 320 °F (160°C) with a screw speed of 300 rpm.
  • TSE co-rotating 25-mm twin-screw extruder
  • 41:1L/D available under the trade designation "COPERION ZSK-25 WORLD LAB EXTRUDER” from Coperion, Ramsey, New Jersey.
  • Barrel zones for the extruder are 4D (100 mm) in length.
  • the extruder is operated at 320 °F (160°C) with a screw speed of 300 rpm.
  • the TSE has a kneading section in barrel zone 4 for incorporating OC1 and/or P(S-VP) into molten PS resin after their addition to the extruder in barrel zone 3.
  • This kneading section is 3D (that is, 3 times the bore diameter) in length, incorporating high-and medium-shear-intensity forwarding kneading elements for dispersive mixing and a low shear-intensity, reversing kneading element for generating a melt seal and distributive mixing.
  • a small atmospheric vent, 1D in length, at the beginning of barrel zone 5 is used to vent any entrapped air from the powder addition in barrel zone 3.
  • a 3.5D mixing section spanned barrel zones 5 and 6
  • a 2.5D mixing section is utilized in barrel zone 7
  • 3D mixing section spanned barrel zones 8 and 9.
  • medium- to low-shear-intensity, forwarding kneading elements and narrow-paddled, low-shear-intensity, reversing kneading elements are utilized to yield appropriate dispersive and distributive mixing.
  • a vacuum of 52 torr (6.9 kPa) is pulled on a 2D (50mm) vacuum vent in barrel zone 9 to remove any volatiles.
  • a gear-type mixing element under the trade designation "ZME” available from Coperion is utilized downstream of the vacuum vent.
  • ZME gear-type mixing element
  • the temperature of the melt stream is monitored and recorded over the kneading sections in barrel zones 4 and 6, respectively, by immersion-depth thermocouples.
  • Continuous extrusion of molten resin into zone 1 of the TSE is accomplished using a 1.25-inch (3.18-cm) single screw extruder (SSE) (available under the trade designation "KILLION KTS-125 SINGLE-SCREW EXTRUDER” from Davis-Standard; Pawcatuck, Connecticut), equipped with a 3.0:1 compression general-purpose screw with 24 flights.
  • SSE single screw extruder
  • Feeding of OC1 and/or P(S-VP) into a 2D (50mm) port open to the atmosphere in barrel zone 3 of the twin-screw extruder is done using a gravimetric feeder equipped with twin auger screws, available under the trade designation "K-TRON GRAVIMETRIC FEEDER, MODEL KCLKT20" from K-Tron International, Pitman, New Jersey.
  • the extrudate from the TSE is metered through a 10.3 mL/revolution gear pump available under the trade designation "NORMAG" from Dynisco Extrusion, Hickory, North Carolina, and extruded through a 1/2-inch (1.3-cm) diameter pipe to form a strand.
  • the strand was cooled at 8 °C in a water bath and pelletized.
  • Feed solutions 1-4 were compounded into Masterbatches 1-4, respectively, according to the General Procedure for Masterbatch Preparation. In each case, a dry extrudate was obtained from the HVP and was pressed into a film and analyzed via XRD, which showed that more than 20 percent of the OC1 had been converted to other forms.
  • Nanocomposites 1-4 were exfoliated and exfoliated.
  • d-layer spacing was observable by XRD analysis and exfoliated silicate platelets were evident by TEM.
  • Representative TEM micrographs of Nanocomposites 1-4 are shown in FIGS. 2-5, respectively.
  • a slurry was prepared with P(S-VP), OC1, and acetone.
  • the slurry composition is shown in Table 4 (below).
  • TABLE 4 Feed Solution P(S-VP), g Clay Clay, g Acetone, g Initial d-Layer spacing, nm Composite d-Layer spacing, nm 5 90.0 OC1 10.0 11.1 2.4 3.5
  • the slurry was devolatilized and compounded in the batch vacuum kneader of Comparative Example D.
  • the kneader was heated to 160 °C and held at a vacuum of 150 torr (20 kPa).
  • the agitators were stirred at a rate of 50 rpm.
  • the resultant composite was mixed and devolatilized for 45 minutes.
  • the batch process was able to remove the solvent and compound the P(S-VP) and OC1 clay.
  • the composite was pressed into a film and analyzed via XRD. The initial d-layer spacing of the clay itself and the final composite d-layer spacing are shown in Table 4. There was no apparent collapsed clay as judged by XRD.
  • Ground P(S-VP) was metered into zone 1 of the TSE used in the General Procedure for Continuous Twin-Screw Extrusion using a gravimetric feeder at a rate of 3.4 kg/hr.
  • the P(S-VP) was allowed to melt in the first two zones of the extruder.
  • OC1 was added using a gravimetric feeder at a rate of 3.4 kg/hr.
  • the resultant Masterbatch A had a 1:1 weight ratio of P(S-VP):OC1.
  • Masterbatch A was extruded, pelletized, and analyzed by XRD whereby it was found to have a d-layer spacing of 3.65 nm.
  • Masterbatch B was the let down in PS according to the General Procedure for Continuous Twin-Screw Extrusion wherein: PS was melted and fed into the TSE at a rate of 6.12 kg/hr; and Masterbatch B was fed into zone 3 at a rate of 0.68kg/hr.
  • the resultant extrudate had a 90:5:5 weight ratio of PS:P(S-VP):OC1.
  • a portion of the extrudate was analyzed via XRD and TEM, which showed the organoclay in the extrudate had a d-layer spacing of 3.32 nm, but TEM showed it was not exfoliated.
  • OC1 was compounded with PS in a twin-screw extruder as in Example 1, except that the PS:OC1 weight ratio was 95:5.
  • TEM analysis confirmed the non-exfoliated nature of these composites. Representative TEM micrographs of the composite illustrating the non-exfoliated nature are shown in Figs. 6-7.
  • Feed Solution P(I-VP) g Clay Clay, g THF, g d-Layer Spacing of Clay, nm Devolatilized Mixture d-Layer spacing, nm D1 105 talc 10.5 315 1.90 1.90 E1 105 kaolin 10.5 315 0.71 0.71
  • BVP batch vacuum kneader
  • the BVP was obtained under the trade designation "MKD 0,6-H60 IKAVISC MEASURING KNEADER” from IKA Labortechnik Gmbh & Co. KG, D-79219 Staufen, Germany.
  • the BVP had a kneading trough that held 600 mL and had a working volume of 300 mL.
  • the bottom of the trough was double walled allowing the batch to be heated via a hot oil circulator. Kneading was accomplished with two kneading paddles fixed to the motor that mixed both horizontally and vertically. The paddles continually wiped the walls and each other.

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Claims (24)

  1. Procédé de préparation d'une composition, le procédé comprenant :
    - le mélange de composants comprenant un premier silicate stratifié ayant un premier espacement de couche d, un copolymère à blocs ayant au moins un bloc qui est compatible avec le premier silicate stratifié, et un solvant pour fournir un premier mélange, dans lequel le premier mélange comprend au moins 10 pour cent en poids du solvant, sur la base du poids total du premier mélange ;
    - le malaxage du premier mélange tout en éliminant au moins une partie du solvant du premier mélange pour fournir un second mélange, dans lequel le second mélange comprend le copolymère à blocs dans lequel a été dispersé au moins un parmi:
    a) un second silicate stratifié ayant un second espacement de couche d qui est plus grand que le premier espacement de couche d ; ou
    b) des feuillets de silicate exfoliés ; et
    où le second mélange contient une quantité inférieure ou égale à 5 pour cent en poids du solvant, sur la base du poids total du second mélange.
  2. Procédé selon la revendication 1, dans lequel le malaxage est effectué à l'aide d'un malaxeur sous vide ou d'une extrudeuse.
  3. Procédé selon la revendication 1, dans lequel le solvant ne fait pas gonfler le premier silicate stratifié.
  4. Procédé selon la revendication 1, dans lequel la quantité totale du second silicate stratifié et les feuillets de silicate exfoliés comprennent au moins 30 pour cent en poids du second mélange.
  5. Procédé selon la revendication 1, dans lequel la quantité totale du second silicate stratifié et des feuillets de silicate exfoliés comprend au moins 40 pour cent en poids du second mélange.
  6. Procédé selon la revendication 1, dans lequel la quantité totale du second silicate stratifié et des feuillets de silicate exfoliés comprend au moins 50 pour cent en poids du second mélange.
  7. Procédé selon la revendication 1, dans lequel la quantité totale du second silicate stratifié et des feuillets de silicate exfoliés comprend au moins 60 pour cent en poids du second mélange.
  8. Procédé selon la revendication 1, dans lequel le second mélange comprend moins de un pour cent du solvant.
  9. Procédé selon la revendication 1, dans lequel le procédé est effectué de manière continue.
  10. Procédé selon la revendication 1, dans lequel le copolymère à blocs comprend un copolymère à deux blocs.
  11. Procédé selon la revendication 1, dans lequel le copolymère à blocs comprend un bloc hautement fluoré.
  12. Procédé selon la revendication 1, dans lequel le copolymère à blocs est choisi parmi le groupe constitué des poly(styrène-4-vinylpyridine), poly(styrène-isoprène-4-vinylpyridine), poly(styrène-butadiène-4-vinylpyridine), poly(isoprène-4-vinylpyridine), poly(butadiène-4-vinylpyridine), versions hydrogénées de poly(butadiène-4-vinylpyridine), poly(styrène-isoprène-4-vinylpyridine), poly(styrène-butadiène-4-vinylpyridine) et poly(isoprène-4-vinylpyridine).
  13. Procédé selon la revendication 1, dans lequel le silicate stratifié comprend la montmorillonite, la nontronite, la bentonite, la beidellite, l'hectorite, la saponite, la sauconite, la fluorohectorite, la stevensite, la volkonskoite, la magadiite, la kenyaite, l'halloysite, l'hydrotalcite, un silicate synthétique stratifié ou une combinaison de ceux-ci.
  14. Procédé selon la revendication 1, dans lequel le silicate stratifié comprend une argile organique.
  15. Procédé selon la revendication 1, comprenant en plus le mélange du second mélange avec une résine polymère pour fournir un nanocomposite, dans lequel le nanocomposite comprend des feuillets de silicate exfoliés dispersés dans la résine polymère.
  16. Procédé selon la revendication 15, dans lequel le procédé est effectué de manière continue.
  17. Procédé selon la revendication 15, dans lequel la résine polymère comprend une résine thermoplastique.
  18. Procédé selon la revendication 15, dans lequel la résine polymère comprend une résine thermodurcissable.
  19. Procédé selon la revendication 15, dans lequel la résine polymère comprend une résine élastomère.
  20. Procédé selon la revendication 15, dans lequel la résine polymère comprend une polyoléfine, un polyuréthanne, un polyamide, un fluoropolymère, un polyimide, un polycarbonate, un polyester, une polysulfone, une polylactone, un polyacétal, un copolymère d'acrylonitrile, un poly(oxyde de phénylène), un poly(sulfure de phénylène), un polystyrène, une polycétone aromatique ou une combinaison de ceux-ci.
  21. Procédé selon la revendication 15, dans lequel la résine polymère comprend une polyoléfine.
  22. Procédé selon la revendication 15, dans lequel le rapport en poids de la résine polymère au copolymère à blocs est dans une plage de 20 à 200, les limites de cette plage étant incluses.
  23. Procédé selon la revendication 15, dans lequel le rapport en poids des feuillets de silicate exfoliés au second silicate stratifié dans le nanocomposite est au moins un.
  24. Procédé selon la revendication 15, dans lequel les feuillets de silicate exfoliés sont contenus dans le nanocomposite dans une quantité de 1 à 5 pour cent en poids, ces deux valeurs étant incluses, sur la base du poids total du nanocomposite.
EP05789908A 2004-09-27 2005-08-23 Procede de preparation d'une composition et de nanocomposites a partir de cette composition Expired - Lifetime EP1794227B1 (fr)

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BRPI0516034A (pt) 2008-08-19
US20060074167A1 (en) 2006-04-06
WO2006036390A1 (fr) 2006-04-06
DE602005004428D1 (de) 2008-03-06
CN101027347B (zh) 2012-06-06
US7691932B2 (en) 2010-04-06
JP2008514748A (ja) 2008-05-08
KR20070060134A (ko) 2007-06-12
AU2005290168A1 (en) 2006-04-06
EP1794227A1 (fr) 2007-06-13
MX2007003420A (es) 2007-05-23
ATE384098T1 (de) 2008-02-15
CN101027347A (zh) 2007-08-29
DE602005004428T2 (de) 2009-01-08
KR101237695B1 (ko) 2013-02-26

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